Handsaw.



F. 0. HAASE.

HANDSAW.

APPLICATIONTII ED MAY 8. 1916. 1,203,537 Patented Oct. 31,191

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UNITED STATES PATENT" cur os.

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To all whom it may concern.-

Be it known that I, FRIEDRICH OTTO HAASE, a citizen of the United States, residingat Kuhn, in the county. of Lamoure and State of North Dakota, have invented certain new and useful Improvements in Handsaws; and I do declare the 'following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which'it appertains to make and use the same. 1

This invention relates to improvements in hand saws, the principal object being to provide a simply constructed device of this character in which is secured a plurality of saw blades any one of which may be used independently of the others.

An additional object is to provide a hand saw having a frame in the outer ends of which the blades designed .for active use are disposed, the inactive blades resting in seats rangement of in the central portion of the frame.

Still another object is to provide simple and eflicient means'for holding the active. saw blades in operative position.

With these and many other objects in view, my invention resides in the novel features of construction, combination and ar-- parts which will be hereinafter more particularly described and claimed. f I

In the accom anying drawing: Figure 1 represents'a si e elevation of. a hand saw constructed in accordance with my invention; Fig. 2 is an enlarged detail view of one end of the frame showing the means for securing the plurality of blades therein; Fig.

. 3 is a vertical transverse section on the I plane of the line detail perspective view of one end of the frame and the ends of the saw blades; and

Ei'g. 5 is a'similar view of one ofthe catch members removed from'the frame.

" l Inits 'preferred embodiment, myinven-T tioh comprises a frame formed of end membefits 1, a longitudinally extending brace bar 2',a'nd a number of saw blades? and 4 which are removably secured in said frame. .It

W111 banded h thesaw blades 3 are posed 'in' the outer ends of the end members 1, and'. these constitute-the active blades either of which may be used for sawing,- while theblades 4 are inactive and disposed intermediate the ends of the end m'embers.

The ends of each of. the saw blades 3 and l are'p i ad l ill h1lk 5, those 9n the Specification of Letters Patent.

Application Med May 8, 1818. Serial). 98,178.

3-3 of Fig. 2; Fig. 4 is a ment, it will be seen "Patented Oct. '31, 1916.

blades 3 being disposed in seats in the ends of the members 1, said seats being formed by the kerfs 6. The outer endsof all of the shanks are screw threaded for engagement an w1th thumb nuts 7. It will be seen that when the shanks of the blades 3 are disposed In the kerfs 6 they may be efl'ectively held thereinby adjusting the thumb nuts 7 thereon, the proper tension being readily accomas plished by the rotation of the proper parts.

The shanks 5 of the posed in notches 8, two pairs of which are formed in each of the end members 1, one pair being formed in each side of each member. This arrangement of the notches ,or seats 8 in one of the end members 1 is clearly shown in Fig. 4 where it will also be noted that the notches on the opposite sides thereof are disposed in the same horizontal plane and on each side of the brace bar 2 and adjacent thereto. In other words, there are a pair of seats 8 formed in each of the end members 1 between said bar 2 and the ends of said member. In order to hold these so blades within the seats 8 a pair of substantially U-shaped catch members 9 is provided for each end member 1, each of these catch members having their arms pivoted intermediate their ends by pivot pins 10 to as the members 1 adjacent the connection of the brace bar 2 therewith. The free ends of each of the arms of each member 9 is bent laterally substantially at right angles theretoto form spring arms 11 which are bent inwardly toward each other to engage the shanks 5. The extreme free ends of these arms 11 are again bent laterally outward as shown at 12 to more readily permit the shanks to be slid beneath the arms 11 into their seats.

In the illustrated embodiment of the in-- vention, four sawblades are shown, two being arranged on eachside of the brace bar 2 but it is obvious that any number of the blades 4 might be disposed intermediate the ends of the end members 1. In the present instance, the shanks 5 of each pair of saw blades 3 and 4 are connected by helical contracting springs 13, hooks 14 being formed on the ends of said springs anddisposed in apertures in said shanks. By this arrangethat when the blades 4 are held in their seats by the catch members 9 the springs 13 tend to move the blades 3 before the others and thus dispose their fii lill s into tight engagement with the botblades 4 are disgether with the thumb nuts 7 efl'ectively hold the blades 3 in operative position and permit either of them to be operated.

As shown in the drawing, the teeth on the different blades are different in size to permit the saw to be used for various kinds of work. When it is desired to use the device on a. class of work in which neither of the blades 3 could be effectively operated, one of the blades 4 is interchanged with the blade 3 with which it is connected by the springs 13. In order to accomplish this change, the thumb nuts 7 on all of the shanks 5 are loosened and then the roper blade 3 is moved outwardly out of the kerfs 6, the pivoted catch members 9 being at the same time moved outwardly to disengage the arms 11 from the shanks of the adjacent blade 4, whereupon the blade 3 may be moved up one side of the members 1 until its shanks rest Within the seats 8 in that side, these seats preferably being those which were previously unoccupied. During this movement of the blade 3, the other blade 4 is simultaneously moved down the other side of the members 1 until its shanks spring into the seats formed by the kerfs 6. Then, when the thumb nuts 7 are tightened this blade 4 will be in active position ready to operate upon the work. In this description of the chang ng of the blades it has been assumed that the ,.lower blades 3 and 4 were interchanged. By providing the form of catch illustrated, all of the blades may be quickly and easily detached from the end members 1 purely by forcing the U-shaped portions thereof apart, this movement bringing the arms 11 together and out of engagement with the shanks 5 and by loosening the thumb nuts 7.

From the foregoing description taken in connection with the accompanying draw- 1ng, it will be seen that a very simply constructcd hand saw has been invented in which a number of idle blades may be carried which may be quickly interchanged with the active blades.

Various forms in the shape and size of the various parts of the device may be made without departing from the scope of the iml 'enltion as defined in the following claims.

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1. In a saw of the class described. a pairof end members each having a kerf in its outer end and a pair of seats, one in each s de thereof, said-seats being spaced from the ends of the members, a pair of saw blades, one having its ends disposed in said kerfs and the other in the seats on one side of said members, said blades being interchangeable, the blade in said kerfs being movable to the unoccupied seats, while the other blade is moving to the outer ends of the members and into such kerfs, and means for holding said blades in operative position.

2. In a saw of the class described, a pair of members each having a seat in its outer end and a seat in its side at a point: spaced from the outer end, a pair of saw blades,

one having. its ends disposed in said seats in the ends of said members and the other in the seats in the sides thereof, and a resilient connection between said saw blades.

3. In a saw of the class described, a pair of end members each having a kerf in its outer end and a seat in its side at a point spaced from the outer end, a pair of saw blades, one having its ends disposed in said kerfs and the other in said seats, said saw blades being interchangeable, pivoted spring acting catches engaging the ends of the last mentioned blade to hold the same in said seats, and means for holding the other blade in operative position.

4. In a saw of the class described, a pair of end members each having a kerf in its outer end and a pair of seats, one in each side thereof, said seats being spaced from the ends of the members, a pair of saw blades having their ends disposed in said kerfs, the other in the seats on one side of said members, said blades being-interchangeable, U-shaped catch members pivoted to the end members adjacent said seats, spring arms extending laterally from the arms of said catch members for engagement with the ends of the saw blades when disposed on e ther side of said end members when in either of said seats, and means for holding said first mentioned saw blade in operative position.

5. In a saw of the class described, a pair of end members each having a kerf in its outer ends and a pair of seats, one in each side thereof, said seats being spaced from the ends of the members, a pair of saw blades one having its ends disposed in said kerfs, the otherin the seats on one side of said members, said blades being interchangeable, U-shaped catch members pivoted to the end members adjacent said seats, spring arms extending laterally from the arms of said catch members for engagement with the ends of the saw blades when disposed on either side of said end members when in either of said seats, and a resilient connection between said blades.

In testimony whereof I have hereunto set my hand in presence witnesses.

FRIEDRICH Witnesses:

DAVID WIRCH, ROBERT Lanes.

OTTO I-IAASE. 

